AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual - Manual (Page 258)

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© 2014 AEM Performance Electronics
Infinity User Manual
Tuning Tips for Boost Control
Tuning Boost Control can be the most time consuming of all the variables of tuning. After the
following testing procedure commences on the dynamometer, note that the race track can create
new "real-world" vehicle loads on the engine so boost control should always be reconfirmed.
Open Infinity Tuner software and connect to the Infinity.
Confirm that the throttle position is set properly (closed < 5%, WOT > 95%) .
Confirm the AFR so that the vehicle has sufficient fuel for boosting.
Open the Boost Control Wizard and click the Boost Output Enable option ON.
Uncheck Boost Feedback Enable to temporarily turn OFF closed loop boost control.
Next, determine if an increase in duty to the wastegate solenoid takes away boost pressure or
makes boost pressure. To determine this, find the particular wastegate setup being used from
the diagrams above. The language of the boost solenoid is in percent duty cycle. This is not
percent open or percent of airflow, it is rather the full-scale percentage of the solenoid where
100% is fully closed or fully open depending on the solenoid used and how it is plumbed.
If more duty decreases boost pressure, check Boost Feedback Invert.
Set the Boost Solenoid Control Frequency channel according to the manufacturer
specifications. Typical 30Hz
The next step before tuning boost is to set the max and overboost cut to eliminate any
overshooting errors which can lead to catastrophic engine problems.
In the Wizard, go to Engine Protection under Setup.
In the Boost Protection section, set the Max Boost Limit and Overboost Allowed option
to safe values.
Open the BoostTab and set the entire BoostBaseDuty1 [% ] Table to 0%.
Start the engine
Go to Log | Start Recording
Using an dynamometer, cautiously go to full throttle but keep an eye on the viewable MAP
channel.
Go to Log | Stop Recording